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Chapter 5
Analog Block Applications Using
Discrete Transfers
Output Data Format
Decimal
15
14
Octal
17
16
0
OE
Module Mode
1
2
3
5-2
Table 5.A
Input Image Table
Word
Word 0
Word 1
Word 2
Word 3
The output image table data format consists of four words. Word 0 is the
configuration word consisting of the output enable bit (OE), module mode,
scaling bit (SM), range select bits, and filter bits. SLC configuration word
is a subset of the PLC except an enable output bit is added; alarms and user
scaling are removed. Words 1 and 2 contain output data. Word 3 is
reserved.
When using the analog block modules with an SLC controller, data is
transferred as discrete data. The data is processed through a 1747-SN
remote I/O scanner module.
The following tables show the word/bit assignments for both discrete input
and output transfer.
Figure 5.2
Discrete Data Transfer Description - Output Table 1/2 Rack
13
12
11
10
15
14
13
12
SM
Bit - Decimal
(Bit - Octal)
Bits 00-15
Input data for channel 0.
(00-17)
Bits 00-15
Input data for channel 1.
(00-17)
Bits 00-15
Input data for channel 2.
(00-17)
Bits 00-15
Input data for channel 3.
(00-17)
09
08
07
06
11
10
07
06
Range
Output Channel 0 Data
Output Channel 1 Data
Not used
Description
05
04
03
02
05
04
03
02
Filter
01
00
01
00
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